The desired attraction force can be provided.The attraction force matching to the actual load can beprovided by changing the shapes of the mating sections of themovable and stationary iron cores.The exciting current is constant regardless of the stroke.The exciting current of an AC solenoid varies depending onthe stroke. With a DC solenoid, however, the exciting current isdetermined by DC resistance only and is constant regardlessof the stroke.Operation noise is reduced.If there is a clearance between the movable and stationaryiron cores of an AC solenoid, the coil may be burnt. In the caseof a DC solenoid, its exciting current is constant regardlessof the clearance of the movable and stationary iron cores.Therefore, a shock-absorbing material can be providedbetween the movable and stationary iron cores to reduceoperation noises.No buzzing noise is generated.DC solenoids do not generate the buzzing noise AC solenoidsgenerate due to the pulsating attraction force.Constant operation time.The operation time of the DC solenoid is constant regardlessof the frequency. This is because it is driven by direct current.Long life is ensured.The service life of the solenoid depends greatly on the amountof mechanical wear between the movable iron core and theguide (pipe). The sliding section of the guide is specially
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Azremy Bin Abd Latiff (hosiden electronics sdn bhd)
lot1 jlnp/1a bangi industrial, Malaysia
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